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Krait (processor)

From Wikipedia - Reading time: 8 min
Krait
General information
Launched2012
Designed byQualcomm
Common manufacturer
  • Qualcomm
Performance
Max. CPU clock rate1 GHz to 2.7 GHz
Cache
L1 cache16 KiB and 16 KiB
L2 cache1 MiB or 2 MiB
Architecture and classification
Instruction setARMv7-A, Thumb-2
Physical specifications
Cores
  • 2 or 4
History
PredecessorScorpion
SuccessorKryo

Qualcomm Krait is an ARM-based central processing unit included in the Snapdragon S4 and earlier models of Snapdragon 400/600/800 series SoCs. It was introduced in 2012 as a successor to the Scorpion CPU and although it has architectural similarities, Krait is not a Cortex-A15 core, but it was designed in-house.[1] In 2015, Krait was superseded by the 64-bit Kryo architecture, first introduced in Snapdragon 820 SoC.

Overview

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  • 11-stage integer pipeline with 3-way decode and 4-way out-of-order speculative issue superscalar execution
  • Pipelined VFPv4[2][under discussion] and 128-bit wide NEON (SIMD)
  • 7 execution ports
  • 4 KB + 4 KB direct mapped L0 cache
  • 16 KB + 16 KB 4-way set associative L1 cache
  • 1 MB (dual-core) or 2 MB (quad-core) 8-way set-associative L2 cache
  • Dual- or quad-core configurations
  • Performance (DMIPS/MHz):
    • Krait 200: 3.3 (28 nm LP)
    • Krait 300: 3.39[3] (28 nm LP)
    • Krait 400: 3.39 (28 nm HPm)
    • Krait 450: 3.51 (28 nm HPm)

See also

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References

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  1. ^ Brian Klug; Anand Lal Shimpi (October 7, 2011). "Qualcomm's New Snapdragon S4: MSM8960 & Krait Architecture Explored". Anandtech. Retrieved 2013-07-28.
  2. ^ Brian Klug; Anand Lal Shimpi (February 21, 2012). "Qualcomm Snapdragon S4 (Krait) Performance Preview - 1.5 GHz MSM8960 MDP and Adreno 225 Benchmarks". Anandtech. Retrieved 2013-07-28.
  3. ^ Linley Gwennap (December 18, 2012). "Krait 300 Bumps Up Performance". Linley on Mobile. The Linley Group. Retrieved 2013-07-28.
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